Maleic anhydride, also known as dehydrated malic anhydride, maleic anhydride and maleic anhydride, isMaleic acidOfAcid anhydride, white crystal with strong pungent smell at room temperature, chemical formula CfourHtwoOthree。
Solubility: soluble in water, acetone, benzene, chloroform and other organic solvents[2]
chemical property
Maleic anhydride hydrolyzes to maleic acid (cis HOtwoCCH=CHCOtwoH) ; 1: 1 alcoholysis to produce mono ester cis HOtwoCCH=CHCOtwoCHthree；As a dienophile in Diels Alder reaction;Coordination with low valent metals, such as Pt (PPhthree)two(MA) and Fe (CO)four(MA)。[1]
Molecular structure data
Announce
edit
Molar refractive index: 19.91[3]
Molar volume (cmthree/mol）：66.0[3]
Isotonic specific volume (90.2K): 178.8[3]
Surface tension (dyne/cm): 53.7[3]
Polarization (10-24cmthree）：7.89[2]
Calculate chemical data
Announce
edit
Reference value of drainage parameter calculation (XlogP): - 0.1[3]
Number of hydrogen bond donors: 0[3]
Number of hydrogen bond receptors: 3[3]
Number of rotatable chemical bonds: 0[3]
Number of tautomers: 0
Topological molecular polar surface area: 43.4[3]
Number of heavy atoms: 7[3]
Surface charge: 0[3]
Complexity: 129[3]
Number of isotope atoms: 0[3]
Determine the number of atomic structure centers: 0[3]
Number of uncertain atomic structure centers: 0[3]
Determine the number of chemical bond structure centers: 0[3]
Number of uncertain chemical bond structure centers: 0[3]
It is mainly used as raw material for producing unsaturated polyester resin, alkyd resin, pesticide malathion, efficient and low toxic pesticide 4049, long-acting iodamine, etc.
Emergency Management
Announce
edit
Leakage emergency treatment
Isolate the leakage contaminated area, set up warning signs around it, and suggest emergency treatment personnel to wear gas masks and chemical protective clothing.Do not contact with the leakage directly. Collect it in a dry, clean and covered container with a clean shovel and transport it to the waste disposal site.If there is a large amount of leakage, it shall be collected and recycled or discarded after harmless treatment.
Protective measures
Respiratory system protection: When the concentration in the air exceeds the standard, you should wear an anti-virus mask.
Eye protection: wear safety glasses.
Protective clothing: wear work clothes (made of anti-corrosion materials).
Hand protection: wear rubber gloves.
Others: After work, take a shower and change clothes.Pay attention to personal hygiene.
First aid measures
Skin contact: Take off the contaminated clothes and immediately flush with water for at least 15 minutes.In case of burns, seek medical treatment.
Eye contact: immediately lift the eyelids and flush with flowing water or normal saline for at least 15 minutes.Get medical attention.
Inhalation: quickly leave the site to a place with fresh air.Keep the respiratory tract unobstructed.Perform artificial respiration when necessary.Get medical attention.
Ingestion: Rinse the mouth immediately and give milk or egg white to those who take it by mistake.Get medical attention.
Extinguishing method: fog water, foam, carbon dioxide, sand.
It can be used for maleic anhydride grafting to produce a variety of compatibilizers and tougheners.
Packaging, storage and transportation
Announce
edit
Precautions for transportation: the package shall be complete and the loading shall be safe when starting transportation.During transportation, the container shall not leak, collapse, fall or be damaged.It is strictly prohibited to mix with oxidants, reducing agents, acids, edible chemicals, etc.During transportation, it shall be protected from sun exposure, rain and high temperature.
Precautions for storage: store in a cool, dry and well ventilated warehouse.Keep away from kindling and heat sources.Keep container sealed.It shall be stored separately from oxidants, reducing agents, acids and edible chemicals, and mixed storage is strictly prohibited.Equip with corresponding types and quantities of fire-fighting equipment.The storage area shall be equipped with appropriate materials to contain leakage.
Packaging precautions: full opening or middle opening steel drum outside the plastic bag or two-layer kraft paper bag;Fiberboard bucket, plywood bucket and cardboard bucket outside the plastic bag or two-layer kraft paper bag;Plastic bucket outside the plastic bag (solid);Plastic bucket (liquid).
security information
Announce
edit
Safety terminology
S22：Do not breathe dust.
Do not breathe dust.
S26：In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
After eye contact, immediately flush with plenty of water and seek medical advice.
S36/37/39：Wear suitable protective clothing, gloves and eye/face protection.
Wear appropriate protective clothing, gloves and eye/face protection.
S45：In case of accident or if you feel unwell, seek medical advice immediately (show the lable where possible).
In case of an accident or feeling unwell, seek medical advice immediately (show the label if possible).
Risk terminology
R22：Harmful if swallowed.
It is harmful if swallowed.
R34：Causes burns.
Causes burns.
R42/43：May cause sensitization by inhalation and skin contact.
